Nature and origin of collapse breccias in the Zechstein of NE England: local observations with cross-border petroleum exploration and production significance, across the North Sea

2020 ◽  
pp. SP494-2019-140
Author(s):  
S. E. Daniels ◽  
M. E. Tucker ◽  
M. J. Mawson ◽  
R. E. Holdsworth ◽  
J. J. Long ◽  
...  
Keyword(s):  
North Sea ◽  
Petroleum Exploration ◽  
Cross Border ◽  
The North ◽  
Exploration And Production ◽  
The North Sea

The integration of public domain lithostratigraphic data into a series of cross-border North Sea well-penetration maps

2020 ◽  
pp. SP494-2020-25
Author(s):  
Henk Kombrink ◽  
Stefano Patruno
Keyword(s):  
North Sea ◽  
Public Domain ◽  
Petroleum Exploration ◽  
The Public ◽  
Cross Border ◽  
The North ◽  
Starting Point ◽  
Geological Information ◽  
Paper Form ◽  
The North Sea

AbstractAs geological information about the North Sea is increasingly made available to the public, there is great potential to build cross-border datasets to enable people to more rapidly filter relevant geological data and also to better understand and further study the subsurface. This paper discusses the construction of such a geological database and presents the associated map set. Public domain lithostratigraphic data from petroleum exploration and appraisal wells drilled in the Norwegian, Danish, German, Dutch and UK North Sea sectors were used to create a series of 13 well-penetration maps, ranging from Basement to Eocene age. In order to produce the maps, lithostratigraphic well tops had to be translated into a chronostratigraphic scheme, followed by building a database and subsequent mapping in a GIS. Three well categories were used for each of the maps: wells that (1) fully penetrate a chronostratigraphic interval, (2) prove it is absent or (3) reach total depth in the interval under consideration. The resulting maps, which will all be discussed and presented in this paper, form a starting point for multiple types of (petroleum) geological screening studies. The North Sea database is freely available in QGIS format and can be easily imported into any geospatial software platform.

scholarly journals SELECTIVE OIL SPILL COMBAT PLANNING FOR OFFSHORE EXPLORATION AND PRODUCTION OPERATIONS IN THE NORTH SEA

1979 ◽  
Vol 1979 (1) ◽  
pp. 641-647
Author(s):  
Johannes Ph. Poley
Keyword(s):  
North Sea ◽  
Contingency Planning ◽  
Coastal Protection ◽  
Oil Composition ◽  
Arrival Times ◽  
The North ◽  
Exploration And Production ◽  
The North Sea ◽  
Central North Sea ◽  
Sea Area

ABSTRACT Experience shows that during emergencies (Ekofisk, Amoco Cadiz) considerable differences of opinion can arise concerning the best combat-action to be taken, in spite of existing approved contingency plans. In this paper, a case is made for an improvement of the decision-making during emergencies through selective contingency planning for offshore operations. In such selective contingency planning, a spill from a specific (potential) source and its impact on a stretch of coastline are being interconnected and analysed. This will involve consideration of source-specific data (such as location, oil-composition, flow-rates, and temperatures), together with such items as estimates of the fate and movement of that oil across the intermediate stretch of sea, seasonal conditions, pollution risks in terms of oil arrival times and amounts, and coastal vulnerability In consultation between government and industry, a scenario for action tailored to that situation then can be decided in advance, both for combat at the spill location and for coastal protection. The paper is illustrated with evidence from the Ekofisk blow-out case, and with the estimated pollution hazard for the Dutch Wad-denzee from an oil blow-out in the central North Sea area.

scholarly journals Pockmark formation and activity, U.K. block 15/25, North Sea

1994 ◽  
Vol 41 ◽  
pp. 34-49
Author(s):  
Alan Judd ◽  
David Long ◽  
Michael Sankey
Keyword(s):  
North Sea ◽  
North Atlantic ◽  
Petroleum Exploration ◽  
Gas Migration ◽  
The North ◽  
Pit Formation ◽  
The North Sea ◽  
Recent Sediments ◽  
Migration Pathways ◽  
Exploration Well

Digital seismic reflection (boomer) profiles of an active pockmark, in UK block 15/25, North Sea, reveal that the feature was formed prior to the deposition of the most recent sediments, probably by vigorous (or even catastrophic) gas escape. This release may have been triggered by the melting of ground ice when North Atlantic waters first entered the North Sea after the last glaciation, about 13,000 years ago. Possible sources of the gas are investigated by examining the composite log from a nearby petroleum exploration well; it is concluded that, although the gas may .originate from the Kimmeridge Clay, it probably comes from lignites of Tertiary age. Its migration towards the seabed is interrupted by local accumulations at several horizons, the shallowest of which (<80 m below seabed) is trapped beneath clayey sediments of the Coal Pit Formation. The topography of the base of this layer apparently controls the location of gas migration pathways to the seabed. As these lead to pockmarks which formed long ago, and as these pockmarks are still active today, it is probable that the migration pathways have remained throughout the intervening period. Gas accumulating beneath the Coal Pit Formation may migrate laterally to reach the pathways.

GEOLOGY AND GEOPHYSICS IN THE DISCOVERY OF GIANT OIL FIELDS

1973 ◽  
Vol 13 (1) ◽  
pp. 3
Author(s):  
P. E Kent
Keyword(s):  
North Sea ◽  
Oil Field ◽  
Petroleum Exploration ◽  
The Arctic ◽  
Continental Margins ◽  
Lateral Plate ◽  
Vertical Movements ◽  
The North ◽  
The North Sea ◽  
Northern Alaska

The paper gives the case histories of discovery in three major oil field areas-Iran, northern Alaska and the North Sea. These areas differ in their regional features and in the consequent requirements for geological and geophysical investigation and delineation. In Iran the earlier discoveries were based entirely on surface geology; geophysics became important with the need for deep survey. In northern Alaska structures mapped at surface gave only minor shows. Seismic surveys following geological deductions on reservoir development led to discovery of the giant Prudhoe Bay field near the Arctic coast. In the North Sea, in the much more complex extension of Permian-Mesozoic basins already well known on land, location of structures has been entirely by seismic survey.There is no close relation between the new Global Tectonics and the location of major oil field belts. The factors controlling the latter are multiple and complex. Resolution of the relative importance of vertical (epeirogenic) displacement as against the effect of lateral plate movement is nevertheless critical, particularly in Alaska.There is at present a large unresolved discrepancy between the times at which some continental margins developed (North Atlantic, East and West Indian Ocean) and with the physical evidence of sea floor spreading. In the three areas quoted, breakdown of the continental margins by vertical movements started in the Permian (—280 million years), but spreading is dated as beginning only in the late Cretaceous (—70 million years). It is the earlier movements, unexplained by current global theories, which have most relevance for petroleum exploration.

Cross-border megasequence stratigraphy of the Northern, Central and Southern North Sea: a comparative tectono-stratigraphic synthesis

2021 ◽  
pp. SP494-2020-228
Author(s):  
Stefano Patruno ◽  
Henk Kombrink ◽  
Stuart G. Archer
Keyword(s):  
North Sea ◽  
Regional Scale ◽  
Foreland Basin ◽  
First Order ◽  
Cross Border ◽  
Southern North Sea ◽  
The North ◽  
Lithostratigraphic Units ◽  
The North Sea ◽  
Basin Fill

AbstractThe Devonian-Recent tectono-stratigraphic history of the Northern, Central and Southern North Sea is here reviewed at a regional scale and four novel cross-border pseudo-Wheeler diagrams are presented to summarize the stratigraphic evolution of the cycles of basin fill and uplift/erosion. In this scheme, six first-order megasequence boundaries have been defined, characterized by extensive and long-lasting erosional hiatuses and major coastal regressions: (1) Caledonian (or Base Devonian) Unconformity; (2) Variscan-Saalian (or Base Permian) Unconformity; (3) Mid Cimmerian (or Intra-Aalenian) Unconformity; (4) Late Cimmerian (or Base Cretaceous) Unconformity; (5) Atlantean (or Near-Base Tertiary) Unconformity; (6) Eridanos (or Mid-Miocene) Unconformity. These surfaces have been linked to regional causal factors ranging from: orogenesis-related compressional uplifts, in either active plate margin settings (1) or foreland basin settings (2); intra-plate dynamically supported uplifts associated with the development of mantle plumes (3, 5 and 6); the end-of-rifting and associated widespread erosion of tilted fault block crests (4).The aforementioned megasequence boundaries punctuate the geodynamic evolution of the North Sea area and facilitate the sub-division of the entire the North Sea sedimentary basin fill into six megasequences, named here from A to F. All the lithostratigraphic units of the North Sea (formations and members) have been described within the context of this first-order tectono-stratigraphic framework. The correlation power of certain stratigraphic markers are also compared and contrasted, together with the potential cross-border equivalence of sedimentary units on different sides of the political median lines.

scholarly journals Geological Evolution of the North Sea: Cross-border Basin Modeling Study on the Schillground High

2013 ◽  
Vol 40 ◽  
pp. 222-231 ◽  
Author(s):  
Sabine Heim ◽  
Rüdiger Lutz ◽  
Susanne Nelskamp ◽  
Hanneke Verweij ◽  
Dirk Kaufmann ◽  
...  
Keyword(s):  
North Sea ◽  
Basin Modeling ◽  
Cross Border ◽  
The North ◽  
Geological Evolution ◽  
The North Sea ◽  
Modeling Study

Oil exploration and production: Impact on the North Sea

1986 ◽  
Vol 3 (4) ◽  
pp. 289-306 ◽  
Author(s):  
B. Dicks ◽  
T. Bakke ◽  
I.M.T. Dixon
Keyword(s):  
North Sea ◽  
Oil Exploration ◽  
The North ◽  
Exploration And Production ◽  
The North Sea
Sign in / Sign up

Export Citation Format

Share Document